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    <title>文本格式化标签</title>
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    <h1><strong>加粗</strong><b>加粗</b></h1>
    <h1><em>倾斜</em><i>倾斜</i></h1>
    <h1><del>删除线</del><s>删除线</s></h1>
    <h1><ins>下划线</ins><U>下划线</U></h1> 
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